Gas-engine relief-valve.



No. 891,541. PATBNTED `mima, '1903'.v

. J. W. HASBURGLv GAS ENGINE RELIEF VALVL APPLICATION FILED MAB. 4. 1907.`

f a primingcup, wherein the means' for pre? venting inspiration -of air through the .reliefl ins UNITED. sTATEs PATENT oEEIoE.V

JOHN W. HASBURG, Oli-CHICAGO, ILLINOIS.

GAS-ENGINE RELIEF-VALVE.

i Specification of Letters Patent.A

Application med March 4, 1907. serial No: 360,333.

Patented June 23, 1908.

-' pression upon the com ression stroke of the engir'ie piston, but wil prevent the inspiration of air through such structure upon `the iration stroke ofthe iston.. y v

further object of my 1nventi'on is to provide 'a relief-valve construction embodying valve operate to protect the priming cup from dust and dirt withouiigngiaterially interfering with the free use Iof thicup forprimingv 'pur oses.

' et leffin-ther object of my invention to providea relief-valveof the character described, 'involving' aspringV pressed check valve for the'prevention of the inspiration of,

air during theinspirationstrokeof the piston,

` wherein the spring tension. on such check 4valve may be variedto adjust its resistance to the passa e. of theifluid from. the engine "Fi 2 is a cross-sectional view of the reliefl ,the 'stem 7, and a priming cylinder 4an thereby regulate the relief operation ofthe valve.

Other and further objects o f my invention ,willbecome apparent'to those'skilled'in the ollowing description taken-'in' art from the conjunctionwith the .accompanying draw# ingvwherein: 1

gure 1 is an elevation 'of a fragment of-an Aengine cylinder@ typical of any usual gas engine construction, equipped with a'relief valve' structure;` embodying my invention.

va ve greatlyv enlarged.

In said drawing,- 5, lndicates in general 'af gas engine cylinder, to which is attached at' lits combustion-chamber end thel relief valye structure," mprising, in the embodiment shown, a bo y 6 consisting of a stem member.

7, screw threaded as at 8 at'v its lower` eX- tremity for connection with the engine 4cyl-l inder,V and provided with longitudinalrelie-f duct 9, a casing '10, for a rotary or oscillating primary valve, between the, extremities of the duct 49 opens.

' teriously effect it.

12 indicates in general `the primary relief valve, which is preferably a rotating or oscillating valve of ordinary construction, having its body portion 13 provided with "an aperture 14 for registration when in one position with the duct 9, and adapted when turned to. close said duct v9, and having any usualform of .operating handle or equivalent de'- vice 15 for manual or non-automatic actuation. v

. The construction thus far described is itself operative as ,a relief valve structure, (althou h not in a practicall satisfactory manner )the opening of the va ve v12 permitting the escape'of fluid from the: engine dur# ing the compression stroke to permitthe engine to be `readily started, and the` cup 11v providing a receptacle for ga'solene or other priming material, which" may be run through the duct 9 and valve 4port 14.` into the `cylp inder. Such construction has in practice, however, great disadvantages, in that as the manualvalve is: open on the inspiration 'stroke as well as 4on the compression stroke 'of the piston, air-is drawn into the cylinder `on the inspiration stroke of the piston through the duct 9, such'air varying from A normal the quantity of the explosive mixture, and preventing the application of the usual suction to the ordinary intake valve.

Furthermore, such inspiration of air brings withit dust anddirt, which may and com- Inonly'does accumulate in the cu introducin into the cylinder of th 'foreign su stances which are apt to e en ine invention lies, therefore, in the provision-0f an automatic check valve 1n association vvwith the fluid passage throughthe relief valve structure, arranged to close during the inspiration stroke of the en ine, and to open durinthe ,compression stro e of the piston;

a\furt er feature of my invention lying in the provlsion ofsuch valvestructure 1n associacup 11, into. whichl p closure, 1 6 indicates general the check tionwith the priming cup 11 in'such m-anner as ,to effectively close such cup durin normal working of the engine, to keep dierefrom all dirt and' other impurities; and other features of m invention being the rovision of an adjusta le tension device for t e valve, and arr effective arrangement of parts where- 'by the structure ma loe cheap y manufactured 'and easil use y 4'in the 'spec' c embodiment of my inven- 11, thusthe i ele- The salient feature of my i l tion herein illustrated for purposes of disvalve structure, 'specifically comprising a valve proper 17, arranged to coact with the seat 18 formed at the inner edge of the rim of cup 11, and provided with a stem 19, posiitself operative, as the weight of the valve Igravity c and its' a purtenances may constitute of it a heck, and it will be apparent that if valve l2 be opened, pressure 1s developed in `the chamber of cup 11 durin the compression stroke ofthe piston, an the valve 17 will lift, permitting the relief desirable, while upon the inspiration strike of the piston the i mal operation vof the engine when the priattendant reduction of ressure within the c'up 11 lwill cause the va ve 17 to seat firmly u on' the properly shaped rim of the cup.

urthermore,A 1t will be seen that in the normary relief valve 12 is c osed, the valve 17 formsy an effective closure for the cup 11 to keep dirt` and `other foreign substances therefrom. Obviously however, -when it is de-,

ever, that the valve 17 shoul sirable to prime the engine in starting it the valve 17 may be ymanuallylifted and the proper uantity of fluid poured into the cup 11 to tric e down into the cylinder through the duct 9 in the usual manner. I refer, howbe spring ressed, and as a further 'refinement of my invention I provide means'for adjusting the spring tension so that the opposition of the valve 17 t0 opening maybe readily regulated. To this end the guide or bridge 20 is centrally threaded as at 21', and the threaded semer bushing 22, apertured as at 23, for the reception in sliding relation of the valve rod 19, is screwed into the threaded ortion 21, and

between such adjustable bus ling 22 and the valve bod -17 .is arranged a coll spring 24. Now it wi l be apparent that by the vertical adjustment of the bushing 22 inthe stationary yoke 20, the tension on spring 24 may be varied and the desired resistance to opening movements of the valve 17 secured. Y

Obviously, on a multiple cylinder engine, the several rimary' relief valves 12 may be connected t rough their handles for. simultaneous operation, the check valves needing no connection;

While I have herein described in some detail an operative embodiment of my invention I do not desire to be understood as limiting myself to the exact construction shown and described, as changes in construction may readil be made Without departure fromthe spirit and scope of my invention.

Havingthus described my invention, what I claim and desire to secure by Letters Patent, of the United States, is:

Inra relief valve structure, a body having a vduct therethrough, and provided with a priminoI cup into which said. duct leads, a manuaI rotary valve controlling said duct, a bridge lmember' spanning the cu an outwardly opening spring-pressed c eck valve guided with res ect to said bridge member and seating ont e rim of said cup.

In testimony whereof I--hereunto set my hand in the presence of two Witnesses.

- -JOHN W, HASBURG.

In the presence of- Gno. T. MAY, Jr.,

. Maar E. ALLEN. 

